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EXCLUSIVE: Adam Levine Hilariously Can't Believe He's Going to Be a Dad: 'They Let Me Make a Baby!'

Excited seems like an understatement here...

"I'm gonna be a f**king dad!" Adam Levine gushed to ET, accepting early congratulations on the impending arrival of his first child. "I'm so excited!"

Only ET was on set with Levine for an upcoming episode of NBC's The Voice, for which he's enlisted the help of rock legend Sammy Hagar to mentor his team through the Battle Rounds. (More on that will be revealed after The Voice's 11th season, premiering Sept. 19, gets underway.)

Hagar, who has four children of his own, couldn't help but beam while offering his own well wishes to the Maroon 5 frontman, whose wife, Behati Prinsloo, is due to give birth in September.

"It'll be the greatest day of your life, the day that baby is born," he sweetly told Levine, prompting an enthusiastic "oh, hell yeah" in response.

But taking home another victory for Team Adam? That would be a pretty great day, too. This season, Levine is up against longtime frenemy Blake Shelton, and newcomers Miley Cyrus and Alicia Keys for the bragging rights.

"Alicia's is the strongest team, mine is probably a not-so-distant second. And then third and fourth, I'm not gonna go down that road and make more enemies," Levine declared, before taking a quick left and heading directly down that road.

"Blake is always the weakest team," he continued. "It's not so much his team, it's just him."

"But, by the way, someone could have the strongest team and then it changes mid-season," he clarified. "There's just no way to tell."

As for the newest pair of coaches, Levine said they're "doing well" in the heat of competition, but are "a little disturbed sometimes" at the antics that he and Shelton pull on set.

"Especially the stuff you don't see. There is some pretty inappropriate material that gets made that's probably in some sort of vault ready at any time to blackmail us," he confessed. "It [wouldn't be] a made-for-TV blooper reel, it's more of an HBO blooper real. A lot of f**ks and s**ts."

We'd expect nothing less from those two.

Shelton had plenty to say about seeing his pal become a father-to-be in an interview with ET earlier this year.

"I'm looking forward to Adam actually having to wake up before noon or one o'clock for the first time in his life, you know, to go change a diaper," Shelton teased. "I think it's going to be good for him. I think the baby is going to do more for Adam than Adam is going to do for the baby. I'll put it to you that way. I'm very happy for him."